C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 3/18 (2006.01) B08B 17/00 (2006.01) B08B 17/06 (2006.01) C09D 5/16 (2006.01) C09D 7/12 (2006.01)
Patent
CA 2503059
A process and a composition are disclosed for producing surfaces that are self- cleaning by water, and in particular, there is disclosed an aqueous system for forming transparent self-cleaning surfaces. In the process, an aqueous mixture comprising (i) nanoparticles having a particle size of less than 300 nanometers and (ii) a surface modifier selected from the group consisting of water-soluble hydrophobic surface modifiers and water-dispersable hydrophobic surface modifiers capable of forming a continuous film from an aqueous solution is provided. The aqueous mixture is applied to a surface, and a self- cleaning transparent coating is formed on the surface upon water evaporation. In one embodiment, the aqueous mixture is essentially free of organic solvents other than coalescing solvents.
L'invention a trait à un procédé et à une composition permettant de produire des surfaces qui sont autonettoyantes sous l'action de l'eau et, en particulier, à un système aqueux destiné à former des surfaces autonettoyantes transparentes. Le procédé consiste à fournir un mélange aqueux comprenant : (i) des nanoparticules dont la taille ne dépasse pas 300 nanomètres, et (ii) un modificateur de surface sélectionné parmi les modificateurs de surface hydrophobes solubles dans l'eau et les modificateurs de surface hydrophobes dispersables dans l'eau pouvant former un film continu à partir d'une solution aqueuse. Le mélange aqueux est appliqué sur une surface, et un revêtement transparent autonettoyant est formé sur la surface lors de l'évaporation de l'eau. Dans un mode de réalisation, le mélange aqueux est essentiellement exempt de solvants organiques autres que des solvants coalescents.
Jones Matthew A.
Valpey Richard S. III
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
S. C. Johnson & Son Inc.
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